/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.datastream.runtime.functions.python;

import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.types.Row;

/**
 * The {@link PartitionCustomKeySelector} will return the first field of the input row value. The input value is
 * generated by the
 * {@link org.apache.flink.datastream.runtime.operators.python.DataStreamPythonPartitionCustomFunctionOperator} after
 * executed user defined partitioner and keySelector function. The value of the first field will be the desired
 * partition index.
 */
public class PartitionCustomKeySelector implements KeySelector<Row, Integer> {
	@Override
	public Integer getKey(Row value) throws Exception {
		return (Integer) value.getField(0);
	}
}
